Canada

Or, we could simply stop extracting the massive amount of carbon that's already nicely sequestered in Alberta in the form of bitumen.

“So what we would do is we would capture the CO2, inject nitrogen, transport it as ammonia and send it to Japan"

I've been struggling to find more details on the specific process she's talking about. As far as I'm aware, you can't sequester carbon dioxide in the form of ammonia, since ammonia doesn't contain carbon or oxygen. So that must mean they use pre-existing ammonia (produced via natural gas) to transport the CO~2~ underground. But that can be done in a closed loop, so shipping it to Japan seems like an entirely separate process, that uses a bunch of energy in both ammonia production and shipping, so that Japan can add more NO~x~ gases to the atmosphere.

Make it make sense.